How to install seconday battery?

[632 Regal]

LMAO you are not dumb but this problem spread to another member in Manila and I wonder if it is some sort of international virus, thus the questions LOL

man i really am dumb

[tim eh?]

LMAO you are not dumb but this problem spread to another member in Manila and I wonder if it is some sort of international virus, thus the questions LOL

y i saw... but i would bet more than just we 2 have this problem... just we notice it b/c i use heat, defrost, lights all the time, and bmwrp8 uses a/c (maybe even aux fan is screwed a bit ?) and we both have been keeping an eye on voltage for other reasons.

i think even ferret has it... said something about 12v with rear defrost on.... no?

it's just battery cables! must be one of the most common problems around in old cars. for sure in humid places anyway. what a total beeeyatchie to get to tho... in my case right now at least...

[ladiesman217]

Amazing theory except the E31 comes factory with 2 batteries. Problem is that the E31 drains so much upon being parked that the need to charge within a month is required whereas the E34 does not. Batts are matched and "at least" 5 years old so that part holds no grounds on my personal vehicle.

whatever you do do not just wire it up in parallel.
anything large enough to be worth the effort will 'fight' the primary battery.
in essence they will take turns dragging each other down in voltage (or trying to charge up the other one) when the car is off, and you'll kill both of them (although maybe if lucky just the secondary) in short order.

Voltage and amperes are just as stated and will charge as required without any trickery, 2 batteries are better than one in a less then adequate environment.

Been there and even matched twins don;t last more than a couple of years or three, even with daily driving.

see above 5 year claim.

Use an isolator wired to ignition. Then the battery is only connected when the key is on, ie driving, starting, etc. IF you drain the primary and the secondary is large enough you'll get a couple of chances to start the car when you flip the ignition on which connects them together again.
Ignition lead on alarm prewire cars is in the 12 pin alarm connector, and readily accessible.

You do know about circuits and my boy would be proud.

Again this is only useful if you are going to be having a lot of key off accessories ( like the lighter/power port always in use, the BMW phone or the vent timer) running, or plan on running a large load in accessory (large amp draw amplifiers for example).
It is kind of a built in jumper cable. it isn't for more key off time.

Agree the vent timer is a big drain but if not used in excess an additional battery should simply not be required in said vehicle.

dude, what is your major malfunction? you get shot in the head or something?

[632 Regal]

Tim are you in a mostly idle area? lots of traffic and crap? If so maybe it is possible to be so low in voltage in this arena with all the aux items on that this would be normal.. at least without backtracking things would see normal/

[ladiesman217]

Bulletin Number: 611200 Bulletin Date: 20000701 Category: 111000 ELECTRICAL SYSTEM:BATTERY
Summary: SERVICE INFORMATION REGARDING PREMATURE BATTERY DISCHARGE ON 850 CSI MODELS. *TT

Btw no hard feelings about deleting the google stock thread since you say you aren;t familiar with VB software. I am sure someone can show you how to delete your own posts without deleting entire threads. Really isn;t hard, I do it all the time on the boards I mod, and I'm sure others here canteach you how to do it..

In the mean time how about a gesture of sincerity and putting the article back up to fix your mistake.

[shogun]

guys, do not mix up the E31 and E34/E32 system.

The E31 system needs BOTH batteries to be in a good shape, otherwise the car even does not start properly.

The E32/E34 system is completely different, that car has no problem to survive without a second battery, and most of the cars even do not have a 2nd installed.
It was OPTION.

But on E31 is is necessary to operate the car!

If you want to know it in detail, study the wiring diagrams E31, E32, E34, or visit E31 boards, that is daily discussion there if a car does not start, always first thing someone will propose is to check both batteries and have both batteries changed at same time and charged completely.

[ladiesman217]

I don't believe you. I am just being polite.

here is the link.
http://www.nytimes.com/2009/01/23/te...l?ref=business

Go press
new thread
copy and paste into it,
hit submit.
Title is: Is google well positioned for next quarter?

Make a demonstration to me and to this forum that you are as sincerely sorry as you signed your apology and protest you are in public.

I'm not much inclined to believe you have an honest bone in your body after what I saw yesterday and today.

[ladiesman217]

thanks shogun... appreciate the back up on the electrical system.

[tim eh?]

Tim are you in a mostly idle area? lots of traffic and crap?

...no... when i am driving normal people are still .

i kept an eye on this last year as it was my first winter with the car and i have had many old cars with charging problems. (and playing with the obc was somewhat of a novelty)

this year i get way less voltage than i did last year...

it's not urgent, i can keep the voltage at a good level if i keep my eye on it.

but i am willing to bet my cabling will look like bmwrp8's ground cables when i get around to pulling them out.

are you sure that it is normal to drain the battery with full accessories on at idle? methinks i am not the only one with old cables...

y'all will have to be patient and wait until spring... don't hold yer breath!

[shogun]

but i am willing to bet my cabling will look like bmwrp8's ground cables when i get around to pulling them out.

here you mention a very important point. Since I changed my cable from alternattor to B+, I get measurable +1 volts more out of the system (at the end where it is needed). That cable was so wrotten, that stopped the flow of the power
http://www.bimmerboard.com/forums/posts/560991/

are you sure that it is normal to drain the battery with full accessories on at idle? me thinks i am not the only one with old cables...

that you can measure. But as long as the red light for the battery does not go on, there should be even enough in idle, but needs to be checked, after you checked the ground cables and the battery /alternator cables and connections.